Merge branch 'mh/fetch-follow-remote-head-config'

The `fetch.followRemoteHEAD` configuration variable has been added to provide a default for the per-remote `remote.<name>.followRemoteHEAD` setting. * mh/fetch-follow-remote-head-config: fetch: fixup a misaligned comment fetch: add configuration variable fetch.followRemoteHEAD fetch: refactor do_fetch handling of followRemoteHEAD fetch: return 0 on known git_fetch_config fetch: rename function report_set_head t5510: cleanup remote in followRemoteHEAD dangling ref test doc: explain fetchRemoteHEADWarn advice fetch: fixup set_head advice for warn-if-not-branch